 /*******************************************************************************
  * Copyright (c) 2005, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.osgi.baseadaptor.bundlefile;

 import java.io.File ;
 import java.io.IOException ;
 import java.util.Enumeration ;

 /**
  * A NestedDirBundleFile uses another BundleFile as its source but
  * accesses all of its resources relative to a nested directory within
  * the other BundleFile object. This is used to support zipped bundles
  * that use a Bundle-ClassPath with an nested directory specified.
  * <p>
  * For Example:
  * <pre>
  * Bundle-ClassPath: nested.jar,nesteddir/
  * </pre>
  * @since 3.2
  */
 public class NestedDirBundleFile extends BundleFile {
     BundleFile baseBundleFile;
     String cp;

     /**
      * Constructs a NestedDirBundleFile
      * @param baseBundlefile the base bundle file
      * @param cp
      */
     public NestedDirBundleFile(BundleFile baseBundlefile, String cp) {
         super(baseBundlefile.basefile);
         this.baseBundleFile = baseBundlefile;
         this.cp = cp;
         if (cp.charAt(cp.length() - 1) != '/') {
             this.cp = this.cp + '/';
         }
     }

     public void close() {
         // do nothing.
 }

     public BundleEntry getEntry(String path) {
         if (path.length() > 0 && path.charAt(0) == '/')
             path = path.substring(1);
         String newpath = new StringBuffer (cp).append(path).toString();
         return baseBundleFile.getEntry(newpath);
     }

     public boolean containsDir(String dir) {
         if (dir == null)
             return false;

         if (dir.length() > 0 && dir.charAt(0) == '/')
             dir = dir.substring(1);
         String newdir = new StringBuffer (cp).append(dir).toString();
         return baseBundleFile.containsDir(newdir);
     }

     public Enumeration getEntryPaths(String path) {
         // getEntryPaths is only valid if this is a root bundle file.
 return null;
     }

     public File getFile(String entry, boolean nativeCode) {
         // getFile is only valid if this is a root bundle file.
 return null;
     }

     public void open() throws IOException {
         // do nothing
 }
 }

